Disclosed is a battery module, which includes a cell stack formed by stacking a plurality of battery cells; a bus bar frame assembly having a front bus bar frame configured to cover one longitudinal side of the cell stack, a rear bus bar frame configured to cover the other longitudinal side of the cell stack and an upper cover configured to cover at least a portion of an upper surface of the cell stack; and a module frame coupled to the bus bar frame assembly in a direction from the rear bus bar frame toward the front bus bar frame or in a direction opposite thereto to accommodate the cell stack and the bus bar frame assembly, wherein the front bus bar frame includes at least one first upper guide formed to protrude at an upper end thereof and at least one first side guide formed to protrude at a side portion thereof, and the rear bus bar frame includes at least one second upper guide formed to protrude at an upper end thereof and at least one second side guide formed to protrude at a side portion thereof.
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